blob格式导出文件

最近在做blob流导出相关功能，其中需要导出excel、csv、word、zip压缩文件之类的，在导出excel和word中需要知道对应的content-type属性，正好看到下面这篇文章，感觉挺好的就记录一下

后缀	MIME Type
.doc	application/msword
.docx	application/vnd.openxmlformats-officedocument.wordprocessingml.document
.xls	application/vnd.ms-excel
.xlsx	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.ppt	application/vnd.ms-powerpoint
.pptx	application/vnd.openxmlformats-officedocument.presentationml.presentation

附带导出excel文件格式的相关js代码

 exportFile(data:any, fileName:string) {
    let blob = new Blob([data], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"});//以二进制形式存储，并转化为Excel
    let now = new Date();
    let date = now.getFullYear() + '-' + (now.getMonth() +1) + '-' + now.getDate();
    let exportFileName = date + ' ' + fileName + ".xlsx";//自定义导出excel表名称
    saveAs(blob, exportFileName); //使用文件导出插件FileSaver.js
  }